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engine stumbles at 1800 RPM 900

posted by  ovlov Guy on  Thu Apr 17 14:35 CST 2014
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last visit: Wed Oct 22 12:25 CST 2014
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I have a 1992 960 wagon with 200000 miles on it problem just started that it stumbles between 1800 and 2500 rpm. Cleaned contacts on massair,and cam sensor,also cleaned throttle plate. Any New ideas had codes 511,512,231,314
thanks in advance








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    engine stumbles at 1800 RPM 900

    posted by  DanR on  Fri Apr 18 11:14 CST 2014
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    last visit: Thu Oct 23 15:25 CST 2014
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    314 is cam sensor, could mean the connector is not making contact, or the connection at the big plug on the shock tower is oxidized. Check that before replacing.

    All the other codes are related to fuel trim issues.
    In order of most likely to be causes, an air leak after the MAF, either in the rubber air ducting, or the oil hoses to the separator. Also a leaking intake manifold gasket, which is quite common. Low or high fuel pressures.

    To rule out the MAF, try running the engine with it disconnected. The engine will go into a default limp home mode, but if the MAF is suspect, the engine should run better with it unplugged.

    I am betting on an air leak somewhere in the system, maybe around the flame trap fitting.

    Do your vent settings change on the dash, since they are activated by vacuum they may not move or be sluggish if there is a sufficient air leak to reduce vacuum pressure.

    DanR '94 964 392,000 miles (158,000 on the new engine)
    '08 S60 T5 - 84,000 miles
    --
    DanR








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      engine stumbles at 1800 RPM 900

      posted by  ovlov Guy on  Mon Apr 21 07:04 CST 2014
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      last visit: Wed Oct 22 12:25 CST 2014
      [RELATED]

      I cleaned and replaced flame trap
      But I have now replaced the cam sensor the original 22 year old one was going bad, the connector was brittle and crumbled when taken apart.
      50 miles on fix and all is happy no codes yet.
      THANKS to everyone and of course the Brickboard







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